Variable-speed control means



May 4,1926. 1,583,375

' J. VlGLlANO VARIABLE SPEED CONTROL MEANS Filed Jan. 16 1926 3 Sheets-Sheet 1 May 4 1926.

J. VIGLIANO VARIABLE SPEED CONTROL MEANS Filed Jan. 16, 1926 IllllIIIIIIIIIIIIIIIIIIIIIII2 5 Sheets-She et 2 may 4,1926. 1,583,375

J. VlGLlANb VARIABLE SPEED CONTROL MEANS Filed Jan. 16, 1926 3 Sheets-Sheet 5 1 1' .7 a q 1 e9 2:? r

I I max I max ance/fox! Jog (9012 l fyliazw Patented May 4, 1926.

U Nl TED f STATES;

PATENT OFFICE. v 1

:rosnrn vremnno, on NEW YORK, N. Y.

:1- i I Y VARIABLE-SPEED CONTROL MEANS.

Application filed lanuary 1c, 1926. Serial No. 81,632.

attaining simple, light weight, but effective variable speed mechanism adapted to uni-- form graduation from minimum to maximum degree, or'vice versa, in contradistinction to restricted and prescribed step graduation as heretofore known in the art, so

' method of step variation of speed; 1

Fig. 11, is a diagram illustrating my method of'unrestricted speed variation.

that power may be transmitted from a generating unit to operative receiving mechanism at any: rate of velocity. desired withing the motion capacity provided for, an. incidental feature being the elimination or the shifting of'gears in changing from one speed to another; and the invention consisting. essentially in the specific construction, combination and arrangement of component parts and appurtenances herein described and .claimed, whereby these and other advantageous, results are attained, all as here inafter set forth. i

In the accompanying drawings I illustrate a practical embodiment of the essential features of my invention in' variablev speed mechanism of the'character designated, al-

though I do not restrict myself to the.

identical from and construction of component parts of the apparatus shown by way of exemplification since changes may be made in minor details and equivalent mechanical expedients resorted to, with like results, and without departing from the spirit and intent of my invention in this respect.

With this understanding Fig. 1, represents a plan view, with the casing broken away in part, and taken on 1 plane of-line 1''1, Fign2, of a preferred construction and arrangementof my improved variable speed transmitting mechanism, set for maximum speed;

Fig. 2, is a longitudinal vertical sectional elevation thereof, taken upon plane of line 22, Fig. 1;

Fig. 3, is a transverse vertical sectional elevation taken upon plane of line 3 3,'

Fig. 1

Fig. a, is a transverse vertical sectional 'elevation taken upon plane of line 4-4:, Fig. 1; Fig. 5, is a vertical sectionaldetail taken upon plane of line 5-5, Fig. 4;

Fig. 6, is a horizontal sectional detail taken upon plane of line 6'6, Fig. 5;

Fig; l, is a viewlike unto'Fig'l, show- ,ing the variant slide setfor medial speed;

Fig. 8, is a, sectional elevation of a detall illustrating a modification in the means for adjusting the variant slide;

Fig. 9?, is a' sectional elevation in detail illustrating stillanother modifioationin the means for adjusting the variant slide;

Fig. 10, is a diagramillustrating the old In the first seven figures of the drawings the means provided for effecting. the adjust- 'ment of the variant slide V, is a worrn scr'ew S, rota-tively mounted at one'extremity in a fixed bearing a, on. the supporting framework A, of the ap aratus, and engaging with a nut 12, integralwith said variant slide V, the outer extremity of said actuating screw "S, being provided with a handle 8, for

manipulative purposes. Inthe modification asin'Fig. 9, the slide S beingact'uated by a lever. 5 In either case the-function attained is'essentially the same in that the variant slide V, may be advanced or retractedjupon and between its supporting ways a, a, on the framework The under side of the variant slide V, is

formed with a longitudinal recess o,1into which protrudes the upper, extremity of an otherwise loosetravelling fulcrum stud F the lower extremity of which is supported in a longitudinal groove Z, formed for the purpose in the upper side of the thrust lever L, the fulcrum Z, of which journalled in a bracket a rigidly affixed to the framework- A, of the apparatus, as shown more particularly in Fig. 3, of the drawings, said fulcrum Z, of the thrust lever L, extending through said bearing bracket a and having rigidly securedto it one arm t, of a toggle T, the other arm t, to which is pivotally connected the crank arm 9, of the power shaft P.

As a consequence the rotation of the power shaft P, will cause its crank arm 10, acting through the medium of the toggle joint T, and fulcrum Z, of the thrust lever L, to vibrate the latter back and forth upon its said fulcrum within the limit prescribed by the said crank motion, and hence to shift the position of the travelling fulcrum stud F, within the longitudinal recess 12, in the variant slide V, and as related to the latter, and in accordance with its position upon and between the ways a, a. Thus in Figs. 1 and 2, the variant slide V, being-positioned at the inner extremity of the adjusting screw S, the fulcrum stud F, will be reciprocated from one end of the recess 1), to the other, full stroke, by the rotation of the power shaft P, whereas when the variant slide V, is adjusted to a medial position, as illustrated in Fig. 7, the travel of the fulcrum stud F, will obviously be restricted accordingly.

. The function of the travelling fulcrum stud F, is to effect and control the movement of the twin rack frame R, by means of which motion is transmit-ted to the work shaft W, through the medium of the rocker pinions g, g, and mitre gearing actuated thereby as hereinafter set forth, and this is "accomplished by reason of the engagement of said travelling fulcrum stud F, with the sides of a slot r, formed for the purpose in the spine or cross bar 9", of said rack frame R, the

' latter being slidably mounted upon and between longitudinal guide rails a a on the inner side walls of the framework A, and being formed with the parallel rack arms 1, 1'", the teeth of which mesh with those of the aforesaid rocker pinions q, 9.. Each pinion g, g is rigidly secured to the outer end of its rock shaft g, each rock shaft 9, being mounted on its standard hearing a rigidly attached to the base plate a of the frame A, as shown more particularly in Fig. 4:, of the drawings. On the inner extremity of each of these said rock shafts q,is loosely mounted amitre drive-gear 9 each meshing with pinion-mitre gears w, .10, which are loosely mounted on thework shaft W. In other words these mitre drive-gears Q2, and pinion mitre gears 10, w, are free on their respective shafts (9, W) except when held to rotate therewith by copulative means. To this end each of the mitre drive gears Q2, is formed with or has rigidly attached to it a ratchet wheel 9 with which engages a pawl gflon an arm 9 rigidly attached to its rock shaft 9', so that each pawl 9 functions to actuate its drive mitre gear 9 intermittently as its rock shaftq, is actuated intermittently by reason of the engagement of its pinion with one of the rack arms 1"", during the reciprocation of the rack frame R; whereas in the case of the pinion mitre gears w, w, they are coupled alternately to the work shaft W, by means of a clutch slide 10 mounted thereon, and controlled by a shift rod 1.0 said clutch slide 'w hein formed with coupling tongues w adapted to engage recesses formed for the purpose in the hubs of the pinion-mitre gears 10, w, as will be understood by reference more particularly to Figs. 1, 4E, 6 and 7, of the drawings. Hence by the shifting of the clutch slide 10 by means of the rod w one or the other of the pinion mitre gears w, may be coupled to the work shaft W. according to requirements.

For instance by shifting the clutch slide 10 upon the work shaft W, from engagement with one pinion mitre gear 20, w, to the other the reversal of motion of the work shaft may be effected, since said pinion mitre gears w, w, are rotated in opposite directions by the mitre drive gears 9 as will be obvious by reference more particularly to Fig. a, of the drawings, it being understood that said mitre drive gears 9 as actuated by their respective ratchet Wheels 9 and pawls g are rotated in opposite directions as related to each other and to the pinion mitre gears w, to. To this end the ratchet wheels g and their pawls g and ratchet arms 9 on their respective rocker shafts g, are relatively reversed in operative position, so that the reciprocation of the rack frame R, acting on both pinions 9, simultaneously will move. the rock'shafts q", in opposite directions, so that one pawl ing power to the pinion mitre gear which is keyed to the work shaft W. That is to say the mitre drive gears Q2, ride idly on the rock shafts except when positively driven by their respective ratchets and pawls, so that they alternate in imparting motion to the work shaft W, during the reciprocation of the rack frame R, the racks r", of which rock the pinions g, and shafts g, in opposite directions, as aforesaid. v

By my construction and arrangement of parts change and regulation of speed and power transmission may be effected gradually, as indicated by the line o-max in the diagram Fig. 11, as compared with the other diagram Fig. 10, which represents the old method of intermittent step adjustment. Furthermore, my mechanism operates uniformly and smoothly, and the shifting of gears under the old method of variant speed is eliminated, hence an applied load may jerks or intermissions.v

It is obvious that in lieu of the crank 79,

motion may be transmitted from the power shaft P, to the toggle joint T, by an ec centric or equivalent mechanical expedient with like results.

WhatI claim as my invention and desire to secure by Letters Patent, is

Variable speed control mechanism of the character designated,comprising a grooved variant slide, means for adjusting the position of said variant slide, a grooved thrust lever, a travelling fulcrum stud extending into the grooves in said variant slide and said thrust lever, a rack frame slotted to straddle said travelling fulcrum stud and formed With parallel rack arms, rock shaft-s 2O gaging said parallel rack arms, mitre drive I having rigidly attached rocker pinions en gears loosely mounted on said rock shafts, ratchet and pawl means for coupling said mitre drive gears to said rock shafts, a Work shaft and mitre pinion gears loosely mounted thereon, clutch means for coupling said mitre pinion gears alternately to said work shaft, a power shaft and means for transmitting motion therefrom to thefulcrum of the said thrust lever, substantially in the 30 manner and for the purpose set forth.

JOSEPH VIGLIANO. 

